Update aperiodic SRS trigger list using MAC-CE

1 . An apparatus for wireless communication at a user equipment (UE), comprising:

memory; and

at least one processor coupled to the memory and configured to:

receive, from a base station via radio resource control (RRC) signaling, a sounding reference signal (SRS) resource set trigger list configuration indicating a plurality of SRS resource set identifiers, wherein each SRS resource set identifier of the plurality of SRS resource set identifiers is associated with a downlink control information (DCI) field value and with at least one SRS resource set;

receive, from the base station via a medium access control (MAC) control element (CE) (MAC-CE), an updated trigger list value to update the SRS resource set trigger list configuration, wherein the updated trigger list value indicates an update for an association between at least one SRS resource set identifier of the plurality of SRS resource set identifiers and the at least one SRS resource set, and wherein a trigger state of the at least one SRS resource set is updated based on the updated trigger list value; and

transmit, to the base station, at least one SRS based on an updated SRS resource set trigger list configuration.

2 . The apparatus of claim 1 , further comprising a transceiver coupled to the at least one processor.

3 . The apparatus of claim 1 , wherein the MAC-CE includes an SRS resource set identifier, wherein the updated trigger list value corresponds to an SRS resource set based on the SRS resource set identifier.

4 . The apparatus of claim 3 , wherein the SRS resource set identifier is utilized with a bit map to correspond with the updated trigger list value.

5 . The apparatus of claim 1 , wherein a plurality of SRS resource sets is updated based on the updated trigger list value.

6 . The apparatus of claim 5 , wherein a respective trigger state of each of the plurality of SRS resource sets is updated based on the MAC-CE.

7 . The apparatus of claim 1 , wherein one or more SRS resource sets are added to the trigger state based on the updated trigger list value.

8 . The apparatus of claim 1 , wherein one or more SRS resource set are removed from the trigger state based on the updated trigger list value.

9 . The apparatus of claim 1 , wherein the MAC-CE is further configured to update SRS resource set parameters, wherein the updated SRS resource set parameters includes at least one of a slot offset for each SRS resource set or a start position for each SRS resource, wherein the MAC-CE includes an SRS resource set identifier and the updated SRS resource set parameters.

10 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

receive, from the base station, downlink control information (DCI) to trigger the at least one SRS resource set; and

transmit at least one SRS based on the SRS resource set trigger list configuration prior to the updated SRS resource set trigger list configuration being enabled.

11 . The apparatus of claim 1 , wherein the at least one processor is further configured to:

receive, from the base station, downlink control information (DCI) to trigger the at least one SRS resource set, wherein the DCI further includes instructions for the UE to change an active bandwidth part (BWP).

12 . A method of wireless communication at a user equipment (UE), comprising:

receiving, from a base station via radio resource control (RRC) signaling, a sounding reference signal (SRS) resource set trigger list configuration indicating a plurality of SRS resource set identifiers, wherein each SRS resource set identifier of the plurality of SRS resource set identifiers is associated with a downlink control information (DCI) field value and with at least one SRS resource set;

receiving, from the base station via a medium access control (MAC) control element (CE) (MAC-CE), an updated trigger list value to update the SRS resource set trigger list configuration, wherein the updated trigger list value indicates an update for an association between at least one SRS resource set identifier of the plurality of SRS resource set identifiers and the at least one SRS resource set, and wherein a trigger state of the at least one SRS resource set is updated based on the updated trigger list value; and

transmitting, to the base station, at least one SRS based on an updated SRS resource set trigger list configuration.

13 . The method of claim 12 , wherein the MAC-CE includes an SRS resource set identifier, wherein the updated trigger list value corresponds to an SRS resource set based on the SRS resource set identifier.

14 . The method of claim 12 , further comprising:

receiving, from the base station, downlink control information (DCI) to trigger the at least one SRS resource set; and

transmitting at least one SRS based on the SRS resource set trigger list configuration prior to the updated SRS resource set trigger list configuration being enabled.

15 . The method of claim 12 , further comprising:

receiving, from the base station, downlink control information (DCI) to trigger the at least one SRS resource set, wherein the DCI further includes instructions for the UE to change an active bandwidth part (BWP).

16 . An apparatus for wireless communication at a base station, comprising:

memory; and

at least one processor coupled to the memory and configured to:

transmit, to a user equipment (UE) via radio resource control (RRC) signaling, a sounding reference signal (SRS) resource set trigger list configuration indicating a plurality of SRS resource set identifiers, wherein each SRS resource set identifier of the plurality of SRS resource set identifiers is associated with a downlink control information (DCI) field value and with at least one SRS resource set;

transmit, to the UE via a medium access control (MAC) control element (CE) (MAC-CE), an updated trigger list value to update the SRS resource set trigger list configuration, wherein the updated trigger list value indicates an update for an association between at least one SRS resource set identifier of the plurality of SRS resource set identifiers and the at least one SRS resource set, and wherein a trigger state of the at least one SRS resource set is based on the updated trigger list value; and

receive, from the UE, at least one SRS based on an updated SRS resource set trigger list configuration.

17 . The apparatus of claim 16 , further comprising a transceiver coupled to the at least one processor.

18 . The apparatus of claim 16 , wherein the MAC-CE includes an SRS resource set identifier, wherein the updated trigger list value corresponds to an SRS resource set based on the SRS resource set identifier.

19 . The apparatus of claim 18 , wherein the SRS resource set identifier is utilized with a bit map to correspond with the updated trigger list value.

20 . The apparatus of claim 16 , wherein a plurality of SRS resource sets is based on the updated trigger list value.

21 . The apparatus of claim 20 , wherein a respective trigger state of each of the plurality of SRS resource sets is based on the MAC-CE.

22 . The apparatus of claim 16 , wherein one or more SRS resource sets are included in the trigger state based on the updated trigger list value.

23 . The apparatus of claim 16 , wherein one or more SRS resource set are not included in the trigger state based on the updated trigger list value.

24 . The apparatus of claim 16 , wherein the MAC-CE is further configured to update SRS resource set parameters, wherein the updated SRS resource set parameters includes at least one of a slot offset for each SRS resource set or a start position for each SRS resource, wherein the MAC-CE includes an SRS resource set identifier and the updated SRS resource set parameters.

25 . The apparatus of claim 16 , wherein the at least one processor is further configured to:

transmit, to the UE, downlink control information (DCI) to trigger the at least one SRS resource set; and

receive at least one SRS based on the SRS resource set trigger list configuration prior to the updated SRS resource set trigger list configuration being enabled.

26 . The apparatus of claim 16 , wherein the at least one processor is further configured to:

transmit, to the UE, downlink control information (DCI) to trigger the at least one SRS resource set, wherein the DCI further includes instructions for the UE to change an active bandwidth part (BWP).

27 . A method of wireless communication at a base station, comprising:

transmitting, to a user equipment (UE) via radio resource control (RRC) signaling, a sounding reference signal (SRS) resource set trigger list configuration indicating a plurality of SRS resource set identifiers, wherein each SRS resource set identifier of the plurality of SRS resource set identifiers is associated with a downlink control information (DCI) field value and with at least one SRS resource set;

transmitting, to the UE via a medium access control (MAC) control element (CE) (MAC-CE), an updated trigger list value to update the SRS resource set trigger list configuration, wherein the updated trigger list value indicates an update for an association between at least one SRS resource set identifier of the plurality of SRS resource set identifiers and the at least one SRS resource set, and wherein a trigger state of the at least one SRS resource set is updated based on the updated trigger list value; and

receiving, from the UE, at least one SRS based on an updated SRS resource set trigger list configuration.

28 . The method of claim 27 , wherein the MAC-CE includes an SRS resource set identifier, wherein the updated trigger list value corresponds to an SRS resource set based on the SRS resource set identifier.

29 . The method of claim 27 , further comprising:

transmitting, to the UE, downlink control information (DCI) to trigger the at least one SRS resource set; and

receiving at least one SRS based on the SRS resource set trigger list configuration prior to the updated SRS resource set trigger list configuration being enabled.

30 . The method of claim 27 , further comprising:

transmitting, to the UE, downlink control information (DCI) to trigger the at least one SRS resource set, wherein the DCI further includes instructions for the UE to change an active bandwidth part (BWP).